Pipe Threading Dies

Pipe Threading Dies

Pipe threading dies cut external (male) threads on the outside of pipe — the threads that engage with female fittings to make a sealed connection. They're the female threading tool, complementary to pipe taps. For plumbers, fabricators, and maintenance teams cutting pipe to length and threading the cut ends, the right die set is essential. AIMS Industrial stocks pipe threading dies for hand and powered threading machine use.

The die types we stock

• Solid (button) dies — single-piece dies for hand threading with a die holder, the simplest option
• Adjustable split dies — adjustable thread depth, useful for threading to specific tolerances
• Threading machine dies — replaceable die heads for power pipe threaders, with quick-change mechanisms
• Pipe threading die heads — receiver-and-jaw assemblies for ridgid-style threading machines
• Replacement die jaws — wear parts for the threading machine die heads

The pipe thread standards we cover

• BSPT (British Standard Pipe Taper) — the most common Australian pipe thread for self-sealing connections
• NPT (American National Pipe Taper) — US-spec taper threads for imported equipment
• BSPP (G-thread, parallel) — parallel threads for connections sealed by O-rings or washers

Sizes

Pipe threading dies cover the common sizes: 1/8, 1/4, 3/8, 1/2, 3/4, 1 inch, 1-1/4, 1-1/2, and 2 inch in BSPT and NPT. Larger sizes (2-1/2 to 4 inch) are available for industrial pipe threading applications, typically as machine die heads rather than hand dies.

Hand threading versus machine threading

For occasional pipe threading (one or two threads in a job), a hand die in a die holder gets the work done — slow but effective for sizes up to about 1 inch. For routine pipe threading (production fabrication, plumbing fitouts), a powered pipe threading machine is many times faster and produces consistently better threads. The ridgid-style threading machine with replaceable die heads is the workshop standard.

Threading practice

Cut the pipe square first — angled or burred ends produce poor threads. Use cutting fluid (Tap Magic, threading oil) generously throughout the cut — pipe threading without lubricant tears threads and ruins dies. Apply steady pressure and let the die do the work; forcing the cut produces poor threads and can break the die. For threaded pipe, the natural taper of BSPT/NPT means the thread is fully cut when the pipe end is flush with the back of the die.

Brands stocked at AIMS

Pipe threading dies are stocked from quality manufacturers chosen for thread accuracy and die life. For machine threading dies, brand-specific replacement heads (Ridgid, Asada, and similar) are available — contact our team with the existing machine make and model for matching die heads.

Companion ranges

For a complete pipe threading setup, see also our Pipe Threading Machines (powered threaders), Pipe Threading System (manual sets), and Pipe Sealants ranges. We can put together a complete kit covering threading, cutting, and sealing.